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Based on the hydrographic data in austral summer during the 22nd Antarctic Expedition of China(2005/2006),some features can be found about the northern margin of Emery ice shelf as follows.The heat content in the surface layer(0-50 m) at the eastern end and the western end of the ice-shelf margin is much higher than that at the middle.The upper mixing-layer depth and the seasonal thermocline depth at the middle of the ice-shelf northern margin are much shallower than those at the both ends.However there is much less difference between the middle and the ends in the bottom layer.The remote sensing photos show that the inhomogeneity in the surface-layer water is closely related to the spatial distribution of the floes and polynia in the area. 相似文献
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南黄海悬浮体的垂直分布特性及其指示意义 总被引：3，自引：0，他引：3
重点研究了南黄海典型断面的悬浮体垂直分布特性及其指示意义。结果表明:四季南海黄海北部断面悬浮体分布的共同特征是西高东低,冬、春季鲁北沿岸流携带悬浮体向南输运和黄海暖流北上是南黄海与北黄海进行物质交换的重要方式和途径;夏半年南黄海中部断面深水域存在的表层云团状悬浮体高值区或"中层悬浮体最大值"现象与该海域的生物活动具有密切的联系;冬、春季苏北浅滩外侧海域近岸区的悬浮体含量显著高于夏、秋季,且冬半年近岸区的悬浮体具有向外海输运的趋势;长江口东北部断面各季节均存在2个悬浮体高值区,其中位于断面西部近岸海域的高值区与长江冲淡水(夏季)或苏北沿岸水(冬季)的影响有关,位于断面东部深水域处的悬浮体高值区是黄海西部沿岸流物质输运的结果,并与济州岛西南部海域的泥质区总体相对应,黄海与东海的物质交换过程主要通过夏季长江冲淡水东北向扩展与冬半年黄海西部沿岸流南下和黄海暖流北上进行。另外,水体层化和陆架锋也显著影响着南黄海悬浮体的垂直分布状况,锋面是控制夏季悬浮体向外海深水区输运的主要物理机制。 相似文献
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As a unique low-temperature water mass in Antarctic coastal region, the Ice Shelf Water (ISW) is an important component for the formation of the Antarctic Bottom Water (AABW). In this paper, we present a criterion for ISW identification based on freezing point at the sea surface, and we study spatial distribution of ISW in front of the Amery Ice Shelf (AIS) and its flow path in Prydz Bay by analyzing hydrographic data from Australian cruises in 2001 and 2002, as well as Chinese cruises in 2003, 2005, 2006, and 2008, all being made in the austral summer. The relatively cold and fresh ISW occurred as several discrete water blocks with cold cores in front of the AIS, within the depth range of 100?600 m, under the seasonal thermocline. ISW had obvious temporal and spatial variations and the spatial distribution pattern changed greatly after 2005. Most of ISW was concentrated west of 73°E during 2001 to 2003 and 2006, but it was widespread to east in 2005 and 2008. In all observation years, a small amount of cold ISW always occurs at the west end of the AIS front section, where the coldest ISW in the whole section also occurred in 2001, 2003 and 2006. Considering general cyclonic circulation pattern under the AIS, the ISW flowing out from west end of the AIS front might have experienced the longest cooling period under ice shelf, so it would have the lowest temperature. Analysis of data from meridian sections in Prydz Bay in 2003 implied that ISW in the west could spread north to the continental break along the east flank of the Fram Bank near 70.5°E, mix with the upwelling Circumpolar Deep Water and possibly contribute to the formation of AABW. 相似文献
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南黄海冷水域西部溶解氧垂直分布最大值现象的成因分析 总被引：1，自引：2，他引：1
重点分析了南黄海冷水域西部溶解氧(DO)垂直分布中的最大值现象,并对DO浓度与主要环境因子的相关性进行了研究.结果表明:DO垂直分布最大值现象是调查海域DO分布的显著特征,且与SCM现象相伴生;DO垂直分布的最大值深度和量值具有较为明显的区域差异;温、盐是DO最大值层以上水体中氧含量的主要控制因素;一定强度的温跃层形成之后,DO最大值层出现在跃层的下界附近,且其氧含量受控于跃层厚度和生物化学作用,并与跃层厚度呈正相关;底层较低的DO含量是底层水及沉积物中有机物分解耗氧的结果.同时,还成功解释了DO最大值处与次表层叶绿素最大值层位置不吻合且量值不相关的原因,并提出了"DO净积累效应"的观点,不仅从时间跨度以及动态的角度上对DO最大值的形成机制进行了分析,而且从理论上探讨了DO最大值层氧含量(或来源)的构成,指出自DO最大值层开始产生至观测之时该层之下、真光层以内水体中的生物化学作用(或Chl-a总产出)才与氧最大值密切相关.总体来看,水体层化和生物化学作用明显影响着夏季南黄海冷水域西部DO的垂直分布. 相似文献
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以金枪鱼碎肉为原料, 采用双酶分步水解法制备高F值酶解液, 通过Box-Behnken试验设计, 分别确定两步酶解的最佳条件, 酶解液经活性炭静态吸附去除游离芳香族氨基酸, 对脱芳后的酶解液进行氨基酸组成分析并测定F值。结果表明, 胃蛋白酶为第一步水解用酶, 酶解的最佳工艺条件为酶用量650U/g, 料水比1∶7(g/mL), 温度35.9℃; 风味蛋白酶为第二步水解用酶, 酶解的最佳工艺条件为酶用量50700U/g, pH 6.51, 温度51℃, 最终水解度达到36.87%±0.54%; 酶解液在pH 3.0, 温度35℃条件下, 经5%(质量体积分数)的活性炭吸附时间3h后, 脱芳率达到63.18%, F值为30.33, 符合高F值肽的要求。 相似文献
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黄海和东海分界线附近水文、化学 总被引：2，自引：0，他引：2
分析和探讨了黄、东海交界海域32.3°N断面化学水文学精细化特征的季节性演替, 结果显示: 化学、水文学要素的空间区域化分布与该断面上环流场的布局及其季节转换存在良好的对应关系, 水团配置对各要素含量及分布起着控制性作用; 冬、春和秋季, 在黄海西部沿岸流影响范围内出现的浊度和悬浮物浓度高值区多与营养盐浓度高值区和pH低值区相共存, 可能是受东海北部气旋式涡旋所产生的辐聚效应的影响, 此高值区中的悬浮物趋于向该海域的底层冷涡区沉积, 夏季此特征则不明显, 从而证实该海域悬浮物沉积作用具有“冬强夏弱”的特征; 夏季123.5°—124.25°E范围海域内存在海水下沉现象, 上层水体中的长江冲淡水可被携带至下层, 导致在夏季长江冲淡水东北向扩展过程中一部分冲淡水从其主体中分离出来; 夏季台湾暖流的阻隔作用使得悬浮物的影响范围远没有长江冲淡水的大, 促使水体和物质输运发生分离。同时, 根据水文和化学各要素分布之间的对应关系, 初步勾勒出了32.3°N断面4季的水团配置状况, 并通过分析东海北部冷水域典型站位的温、盐度垂直结构, 在一定程度上印证了该冷水的形成过程。 相似文献